Kayl was a Human Starfleet officer aboard the U.S.S. Phoenix-X. She held the rank of Lieutenant, and was Chief of Operations, capable of doubling as a science officer when needed. Against her wishes, she was genetically enhanced in a way that made her telepathic.

In 2406, she and many others were caught in a massive molecular reversion field which caused her and everyone in it to revert to a younger age. This caused everyone involved to temporarily lose years of memory, and in most cases, retake Starfleet Academy.